该博文作为uniapp的通用笔记项
-
在mounted函数内发送请求
-
路由跳转时添加动画：
uni.navigateTo({
url: '../demo/index',
animationType: 'pop-in',
animationDuration: 200
})
- 设置缓存时添加success方法：
uni.setStorage({
key: 'storage_',
data: images.small,
success: function() {
console.log(`item.images.small`);
}
})
- 对数组对象进行过滤，num表示要保留数组内几个对象，默认保留三个以下
filterArr(arr, num = 3){
if(arr.length <= 2) {
return arr
}
let newArr = arr.filter((e,i)=>{
return i < num
})
return newArr
},
- 判断对象的内容是否为空
Object.keys(obj).length - 判断数组是否为空
arr.length - 简单日期过滤，仅保留年月日
filterTime(val){
if(val !== null && val !== undefined){
if(val.length > 10){
return val.slice(0,10)
}
return val
}
return val
},
- 剔除富文本中的标签，如果有多个使用冒号分隔
// 正则匹配
filterP(val){
if(val!==null && val !== ' ' && val !== undefined ){
let req = /</?(?:p)[^>]*>/g
return val.replace(req,'')
}else{
return '-'
}
}
七个关于背景图的骚操作 摘自https://zhuanlan.zhihu.com/p/148204848?utm_source=qq&utm_medium=social
1 背景图自适应
body {
background-image: url('https://images.unsplash.com/photo-1573480813647-552e9b7b5394?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2253&q=80');
background-repeat: no-repeat;
background-position: center;
background-attachment: fixed;
background-size: cover;
-webkit-background-size: cover;
-moz-background-size: cover;
-o-background-size: cover;
}
2 单个容器单位内添加多张背景图
body {
background-image:
url(https://image.flaticon.com/icons/svg/748/748122.svg),
url(https://images.unsplash.com/photo-1478719059408-592965723cbc?ixlib=rb-1.2.1&auto=format&fit=crop&w=2212&q=80);
background-position: center, top;
background-repeat: repeat, no-repeat;
background-size: contain, cover;
}
3 创建一个三角形背景
思路是这样的，首先创建两个div，然后将两个背景都添加到其中，然后，第二个div使用clip-path属性画出三角形。
<body>
<div class="day"></div>
<div class="night"></div>
</body>
body {
margin: 0;
padding: 0;
}
div {
position: absolute;
height: 100vh;
100vw;
}
.day {
background-image: url("https://images.unsplash.com/photo-1477959858617-67f85cf4f1df?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2613&q=80");
background-size: cover;
background-repeat: no-repeat;
}
.night {
background-image: url("https://images.unsplash.com/photo-1493540447904-49763eecf55f?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
background-size: cover;
background-repeat: no-repeat;
clip-path: polygon(100vw 0, 0% 0vh, 100vw 100vh);
}
- 背景图像上添加叠加渐变
body {
background-image:
linear-gradient(4deg, rgba(38,8,31,0.75) 30%, rgba(213,49,127,0.3) 45%, rgba(232,120,12,0.3) 100%),
url("https://images.unsplash.com/photo-1503803548695-c2a7b4a5b875?ixlib=rb-1.2.1&auto=format&fit=crop&w=2250&q=80");
background-size: cover;
background-repeat: no-repeat;
background-attachment: fixed;
background-position: center
}
5.创建一个颜色动态变化的背景
HTML CSSResult
EDIT ON
@keyframes background-overlay-animation {
0% {
background-image:
linear-gradient(4deg, rgba(255,78,36,0.3) 50%, rgba(255,78,36,0.3) 100%), url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
25% {
background-image:
linear-gradient(4deg, rgba(213,49,127,0.3) 50%, rgba(213,49,127,0.3) 100%), url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
50% {
background-image:
linear-gradient(4deg, rgba(36,182,255,0.3) 50%, rgba(36,182,255,1) 100%),
url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
100% {
background-image:
linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%),
url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
}
@-webkit-keyframes background-overlay-animation {
0% {
background-image:
linear-gradient(4deg, rgba(255,78,36,0.3) 50%, rgba(255,78,36,0.3) 100%)
url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
25% {
background-image:
linear-gradient(4deg, rgba(213,49,127,0.3) 50%, rgba(213,49,127,0.3) 100%),
url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
50% {
background-image:
linear-gradient(4deg, rgba(36,182,255,0.3) 50%, rgba(36,182,255,1) 100%),
url("https://images.unsplash.com/photo-1559310589-2673bfe16970?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2250&q=80");
}
100% {
background-image:
linear-gradient(4deg, rgba(0,255,254,0.3) 50%, rgba(0,255,254,0.3) 100%),
}
7 制作网格背景图像
<body>
<div class="container">
<div class="item_img"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
<div class="item_img"></div>
<div class="item"></div>
</div>
</body>
body {
margin: 0;
padding: 0;
}
.container {
position: absolute;
100%;
height: 100%;
background: black;
display: grid;
grid-template-columns: 25fr 30fr 40fr 15fr;
grid-template-rows: 20fr 45fr 5fr 30fr;
grid-gap: 20px;
.item_img {
background-image: url('https://images.unsplash.com/photo-1499856871958-5b9627545d1a?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2207&q=80');
background-repeat: no-repeat;
background-position: center;
background-attachment: fixed;
background-size: cover;
}
}
7 将背景图像设置为文本颜色（类似ps填充效果）
原理：使用background-image与 background-clip
<body>
<h1>Hello world!</h1>
</body>
body {
display: flex;
align-items: center;
justify-content: center;
flex-direction: column;
100%;
text-align: center;
min-height: 100vh;
font-size: 120px;
font-family:Arial, Helvetica, sans-serif;
}
h1 {
background-image: url("https://images.unsplash.com/photo-1462275646964-a0e3386b89fa?ixlib=rb-1.2.1&ixid=eyJhcHBfaWQiOjEyMDd9&auto=format&fit=crop&w=2600&q=80");
background-clip: text;
-webkit-background-clip: text;
color: transparent;
}